This chapter presents several methods of distance ranging for basic short
baseline arrays. These methods are either based on basic array positioning equations
or on basic physical definitions, but the final mathematical form of these methods is
proved to be the same. From the derivation of the ranging solution, we can see that
the one-dimensional double-base array is the basis of the plane positioning analysis.
Whether it is based on the Doppler frequency shift signal or the motion parameters, it
can be attributed to the positioning solution of the one-dimensional double-base array.